3 * Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>.
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "bitstream.h"
27 #include "dnxhddata.h"
29 #include "mpegvideo.h"
33 unsigned int width, height;
35 unsigned int frame_size;
36 unsigned int coding_unit_size;
39 const uint8_t *luma_weigth, *chroma_weigth;
40 const uint8_t *dc_codes, *dc_bits;
41 const uint16_t *ac_codes;
42 const uint8_t *ac_bits, *ac_level;
43 const uint8_t *ac_run_flag, *ac_index_flag;
44 const uint16_t *run_codes;
45 const uint8_t *run_bits, *run;
49 AVCodecContext *avctx;
52 int cid; ///< compression id
53 unsigned int width, height;
54 unsigned int mb_width, mb_height;
55 uint32_t mb_scan_index[68]; /* max for 1080p */
56 int cur_field; ///< current interlaced field
57 VLC ac_vlc, dc_vlc, run_vlc;
60 DECLARE_ALIGNED_16(DCTELEM, blocks[8][64]);
61 DECLARE_ALIGNED_8(ScanTable, scantable);
62 const CIDEntry *cid_table;
65 static const CIDEntry cid_table[] = {
66 { 1237, 1920, 1080, 0, 606208, 606208, 4, 8,
67 dnxhd_1237_luma_weigth, dnxhd_1237_chroma_weigth,
68 dnxhd_1237_dc_codes, dnxhd_1237_dc_bits,
69 dnxhd_1237_ac_codes, dnxhd_1237_ac_bits, dnxhd_1237_ac_level,
70 dnxhd_1237_ac_run_flag, dnxhd_1237_ac_index_flag,
71 dnxhd_1237_run_codes, dnxhd_1237_run_bits, dnxhd_1237_run },
72 { 1238, 1920, 1080, 0, 917504, 917504, 4, 8,
73 dnxhd_1238_luma_weigth, dnxhd_1238_chroma_weigth,
74 dnxhd_1238_dc_codes, dnxhd_1238_dc_bits,
75 dnxhd_1238_ac_codes, dnxhd_1238_ac_bits, dnxhd_1238_ac_level,
76 dnxhd_1238_ac_run_flag, dnxhd_1238_ac_index_flag,
77 dnxhd_1238_run_codes, dnxhd_1238_run_bits, dnxhd_1238_run },
78 { 1243, 1920, 1080, 1, 917504, 458752, 4, 8,
79 dnxhd_1243_luma_weigth, dnxhd_1243_chroma_weigth,
80 dnxhd_1238_dc_codes, dnxhd_1238_dc_bits,
81 dnxhd_1238_ac_codes, dnxhd_1238_ac_bits, dnxhd_1238_ac_level,
82 dnxhd_1238_ac_run_flag, dnxhd_1238_ac_index_flag,
83 dnxhd_1238_run_codes, dnxhd_1238_run_bits, dnxhd_1238_run },
86 static int dnxhd_get_cid_table(int cid)
89 for (i = 0; i < sizeof(cid_table)/sizeof(CIDEntry); i++)
90 if (cid_table[i].cid == cid)
95 #define DNXHD_VLC_BITS 9
96 #define DNXHD_DC_VLC_BITS 6
98 static int dnxhd_decode_init(AVCodecContext *avctx)
100 DNXHDContext *ctx = avctx->priv_data;
103 dsputil_init(&ctx->dsp, avctx);
104 avctx->coded_frame = &ctx->picture;
105 ctx->picture.type = FF_I_TYPE;
109 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
111 if (!ctx->cid_table) {
114 if ((index = dnxhd_get_cid_table(cid)) < 0) {
115 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
118 ctx->cid_table = &cid_table[index];
119 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
120 ctx->cid_table->ac_bits, 1, 1,
121 ctx->cid_table->ac_codes, 2, 2, 0);
122 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, 12,
123 ctx->cid_table->dc_bits, 1, 1,
124 ctx->cid_table->dc_codes, 1, 1, 0);
125 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
126 ctx->cid_table->run_bits, 1, 1,
127 ctx->cid_table->run_codes, 2, 2, 0);
129 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
134 static int dnxhd_decode_header(DNXHDContext *ctx, uint8_t *buf, int buf_size, int first_field)
136 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
139 if (buf_size < 0x280)
142 if (memcmp(buf, header_prefix, 5)) {
143 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
146 if (buf[5] & 2) { /* interlaced */
147 ctx->cur_field = buf[5] & 1;
148 ctx->picture.interlaced_frame = 1;
149 ctx->picture.top_field_first = first_field && ctx->cur_field == 1;
150 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
153 ctx->height = AV_RB16(buf + 0x18);
154 ctx->width = AV_RB16(buf + 0x1a);
156 dprintf(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height);
158 if (buf[0x21] & 0x80) {
159 av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n");
163 ctx->cid = AV_RB32(buf + 0x28);
164 dprintf(ctx->avctx, "compression id %d\n", ctx->cid);
166 if (dnxhd_init_vlc(ctx, ctx->cid) < 0)
169 if (buf_size < ctx->cid_table->coding_unit_size) {
170 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
174 ctx->mb_width = ctx->width>>4;
175 ctx->mb_height = buf[0x16d];
177 if (ctx->mb_height > 68) {
178 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big\n");
182 dprintf(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
183 for (i = 0; i < ctx->mb_height; i++) {
184 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
185 dprintf(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
186 if (buf_size < ctx->mb_scan_index[i] + 0x280) {
187 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
195 static int dnxhd_decode_dc(DNXHDContext *ctx)
199 len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
200 return len ? get_xbits(&ctx->gb, len) : 0;
203 static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale)
205 int i, j, index, index2;
206 int level, component, sign;
207 const uint8_t *weigth_matrix;
210 component = 1 + (n&1);
211 weigth_matrix = ctx->cid_table->chroma_weigth;
214 weigth_matrix = ctx->cid_table->luma_weigth;
217 ctx->last_dc[component] += dnxhd_decode_dc(ctx);
218 block[0] = ctx->last_dc[component];
219 //av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]);
221 index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2);
222 //av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index);
223 level = ctx->cid_table->ac_level[index];
224 if (!level) { /* EOB */
225 //av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n");
228 sign = get_sbits(&ctx->gb, 1);
230 if (ctx->cid_table->ac_index_flag[index]) {
231 level += get_bits(&ctx->gb, ctx->cid_table->index_bits)<<6;
234 if (ctx->cid_table->ac_run_flag[index]) {
235 index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2);
236 i += ctx->cid_table->run[index2];
239 j = ctx->scantable.permutated[i];
240 //av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j);
241 //av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weigth %d\n", level, weigth_matrix[i]);
242 level = (2*level+1) * qscale * weigth_matrix[i];
243 if (weigth_matrix[i] != 32) // FIXME 10bit
246 level = (level^sign) - sign;
249 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
253 //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
258 static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
260 int dct_linesize_luma = ctx->picture.linesize[0];
261 int dct_linesize_chroma = ctx->picture.linesize[1];
262 uint8_t *dest_y, *dest_u, *dest_v;
266 ctx->dsp.clear_blocks(ctx->blocks[0]);
267 ctx->dsp.clear_blocks(ctx->blocks[2]); // FIXME change clear blocks to take block amount
269 qscale = get_bits(&ctx->gb, 11);
270 skip_bits1(&ctx->gb);
271 //av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale);
273 for (i = 0; i < 8; i++) {
274 dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale);
277 if (ctx->picture.interlaced_frame) {
278 dct_linesize_luma <<= 1;
279 dct_linesize_chroma <<= 1;
282 dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << 4);
283 dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << 3);
284 dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << 3);
286 if (ctx->cur_field) {
287 dest_y += ctx->picture.linesize[0];
288 dest_u += ctx->picture.linesize[1];
289 dest_v += ctx->picture.linesize[2];
292 dct_offset = dct_linesize_luma << 3;
293 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
294 ctx->dsp.idct_put(dest_y + 8, dct_linesize_luma, ctx->blocks[1]);
295 ctx->dsp.idct_put(dest_y + dct_offset, dct_linesize_luma, ctx->blocks[4]);
296 ctx->dsp.idct_put(dest_y + dct_offset + 8, dct_linesize_luma, ctx->blocks[5]);
298 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
299 dct_offset = dct_linesize_chroma << 3;
300 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
301 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
302 ctx->dsp.idct_put(dest_u + dct_offset, dct_linesize_chroma, ctx->blocks[6]);
303 ctx->dsp.idct_put(dest_v + dct_offset, dct_linesize_chroma, ctx->blocks[7]);
309 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, uint8_t *buf, int buf_size)
312 for (y = 0; y < ctx->mb_height; y++) {
315 ctx->last_dc[2] = 1024; // 1024 for levels +128
316 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
317 for (x = 0; x < ctx->mb_width; x++) {
319 dnxhd_decode_macroblock(ctx, x, y);
320 //STOP_TIMER("decode macroblock");
326 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
327 uint8_t *buf, int buf_size)
329 DNXHDContext *ctx = avctx->priv_data;
330 AVFrame *picture = data;
333 dprintf(avctx, "frame size %d\n", buf_size);
336 if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
339 avctx->pix_fmt = PIX_FMT_YUV422P;
340 if (avcodec_check_dimensions(avctx, ctx->width, ctx->height))
342 avcodec_set_dimensions(avctx, ctx->width, ctx->height);
345 if (ctx->picture.data[0])
346 avctx->release_buffer(avctx, &ctx->picture);
347 if (avctx->get_buffer(avctx, &ctx->picture) < 0) {
348 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
353 dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
355 if (first_field && ctx->picture.interlaced_frame) {
356 buf += ctx->cid_table->coding_unit_size;
357 buf_size -= ctx->cid_table->coding_unit_size;
359 goto decode_coding_unit;
362 *picture = ctx->picture;
363 *data_size = sizeof(AVPicture);
367 static int dnxhd_decode_close(AVCodecContext *avctx)
369 DNXHDContext *ctx = avctx->priv_data;
371 if (ctx->picture.data[0])
372 avctx->release_buffer(avctx, &ctx->picture);
373 free_vlc(&ctx->ac_vlc);
374 free_vlc(&ctx->dc_vlc);
375 free_vlc(&ctx->run_vlc);
379 AVCodec dnxhd_decoder = {
383 sizeof(DNXHDContext),